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A Critique of Single Point Sensing
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English
Abstract
In two previous SAE papers (1,2) by the authors, supporting analysis was presented showing the difficulty in achieving a timely response to real-crash events using a single point sensor mounted in the non-crush zone of the vehicle (tunnel, cowl, etc.). The analysis demonstrated the propensity to deploy the air bag(s) late during certain of these events. If a vehicle occupant was not wearing a safety belt, the deceleration forces of the crash could place the occupant out of position and resting against the air bag when it was deployed. In another SAE paper (3) by H. J. Mertz et al, the authors demonstrated that animals, used as surrogates for humans, could be injured if positioned against an air bag at the time of deployment.
Arguments are presented here to show that there is insufficient information in the crash pulse as sensed in the non-crush zone to deploy an air bag in time for the unbelted occupant. It is therefore not possible to create an algorithm for an electronic sensor, based on the crash pulse information in the non-crush zone alone, which will initiate air bag deployment in time for all cases. Therefore, sensing in the crush zone is required.
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Authors
Citation
Breed, D., Sanders, W., and Castelli, V., "A Critique of Single Point Sensing," SAE Technical Paper 920124, 1992, https://doi.org/10.4271/920124.Also In
References
- Breed, D.S. Castelli, V. “Problems in Design and Engineering of Air Bag Systems” SAE 880724 1988
- Breed, D.S. Castelli, V. “Trends in Sensing Frontal Impacts” SAE 890750 1989
- Castelli, V. Breed, D.S. “Trends in Sensing Side Impacts” SAE 890603 1989
- Breed, D.S. Castelli, V. Shokoohi, F. “Are Barrier Crashes Sufficient for Evaluating Air Bag Sensor Performance?” SAE 900548 1990
- Breed, D.S. Sanders, W.T. Castelli, V. “Performance of a Crush Sensor for Use with Automobile Air Bag Systems” Automotive Technologies International, Inc. Report 14102 November 1991
- Mertz, H.J. Driscoll, G.D. Lenox, J.B. Nyquist, G.W. Weber, D.A. “Response of Animals Exposed to Deployment of Various Passenger Inflatable Restraint System Concepts for a variety of Collision severities and Animal Positions” SAE 826047 1982
- Prasad, A.K. “Energy Dissipated in Vehicle Crush - A Case Study Using Repeated Test Technique” SAE 900412 1990